Study on Road Performance Parameters and Field Test of Solidified Waste Soil

In the construction of subgrade filling, a lot of high quality fillers is needed to control the settlement under traffic loading. However, under the theme of environmental protection, the filling materials are becoming harder to obtain. At the same time, there will be a lot of waste soil in the river construction, waste soil treatment is also a big problem. Based on this, this paper uses the waste soil solidification treatment as the subgrade filler to solve the above problems. In order to verify the feasibility of solidified soil as subgrade filler, indoor compaction test with different solidified soil filling curing time, multiple groups of curing agent ratio, CBR strength test of solidified soil with different filling curing time and resilience modulus test were carried out. The field test of solidified soil subgrade filling and mixed soil and stone filling is also carried out. During the filling process, the settlement value and earth pressure value on both sides of the subgrade and the position of the center line of the subgrade are monitored. The results show that the optimum water content is 19% when the maximum compaction degree can be obtained after 7 days of curing. When the waste soil with 65% water content is added with 9% cement and 2% slag powder, the maximum CBR value is 36.4%, which is the best dosage of curing agent, and fully meets the strength requirements of the filling. In addition, the CBR value of solidified soil is significantly increased with the increase of the curing time. When the curing time of solidified soil is 7d under the best dosage, the design value of the resilience modulus of solidified soil is 56MPa, which fully meets the requirements of the resilience modulus of asphalt roadbed filler. Field test shows that solidified soil as subgrade filling has good feasibility, compared with mixed soil and stone filling subgrade, solidified soil filling subgrade shows better integrity and light quality, and has better filling effect.